165491236 has 12 divisors (see below), whose sum is σ = 290368512. Its totient is φ = 82528808.

The previous prime is 165491203. The next prime is 165491239. The reversal of 165491236 is 632194561.

It is a junction number, because it is equal to n+sod(n) for n = 165491195 and 165491204.

It is not an unprimeable number, because it can be changed into a prime (165491239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52480 + ... + 55543.

It is an arithmetic number, because the mean of its divisors is an integer number (24197376).

Almost surely, 2^165491236 is an apocalyptic number.

It is an amenable number.

165491236 is a deficient number, since it is larger than the sum of its proper divisors (124877276).

165491236 is a wasteful number, since it uses less digits than its factorization.

165491236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108410 (or 108408 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 165491236 is about 12864.3397032261. The cubic root of 165491236 is about 549.0244259501.

It can be divided in two parts, 165 and 491236, that added together give a square (491401 = 701²).

The spelling of 165491236 in words is "one hundred sixty-five million, four hundred ninety-one thousand, two hundred thirty-six".